Woooow... the sheer onrush of ingeniously mind-boggling LEGO techniques has left me stunned and wordless. I won't even try to name all of those techniques I see in this, there's too many to even keep track of, not to mention I wouldn't know where to start. I suppose I'll simply leave you with "congratulations".
Excellent wall technique! I'd love to see a large scale puzzle with the test subject jumping through portals :) My style doesn't exactly use minifigs, but if I was to use them, I'd try to make something like this :)
I don't play video games, but if I had a choice, I'd play Portal. I've seen videos of someone playing Portal 2, and it looked awesome. Your MOC really captures the essence of Portal, and like always, it looks fantabulous!